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參數資料
| 型號： | MAX1748EUE |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Triple-Output TFT LCD DC-DC Converter |
| 中文描述： | 2 A SWITCHING REGULATOR, 1250 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, 1.10 MM HEIGHT, 0.65 MM PITCH, MO-153-AB, TSSOP-16 |
| 文件頁數： | 9/16頁 |
| 文件大?。?/td> | 277K |
| 代理商： | MAX1748EUE |
M
Triple-Output TFT LCD DC-DC Converter
_______________________________________________________________________________________
9
the soft-start period into four phases. During phase 1,
the MAX1748 limits the current limit to only 0.38A (see
Electrical Characteristics
), approximately a quarter of
the maximum current limit (I
LX(MAX)
). If the output does
not reach regulation within 1ms, soft-start enters phase
II and the current limit is increased by another 25%.
This process is repeated for phase III. The maximum
1.5A (typ) current limit is reached within 3.0ms or when
the output reaches regulation, whichever occurs first
(see the Startup Waveforms in the
Typical Operating
Characteristics
).
For the charge pumps, soft-start is achieved by control-
ling the rise rate of the output voltage. The output volt-
age regulates within 4ms, regardless of output
capacitance and load, limited only by the regulator
’
s
output impedance.
Shutdown
A logic-low level on
SHDN
disables all three MAX1748
converters and the reference. When shut down, supply
current drops to 0.1μA to maximize battery life and the
reference is pulled to ground. The output capacitance
and load current determine the rate at which each out-
put voltage will decay. A logic-level high on
SHDN
power activates the MAX1748 (see
Power-Up
Sequencing
). Do not leave
SHDN
floating. If unused,
connect
SHDN
to IN.
Power-Up Sequencing
Upon power-up or exiting shutdown, the MAX1748
starts a power-up sequence. First, the reference pow-
ers up. Then the main DC-DC step-up converter pow-
ers up with soft-start enabled. Once the main boost
LX
GND
PGND
1.25V
R2
V
IN
= 2.7V TO 5.5V
L1
IN
R1
Q
R
S
OSC
REF
FB
V
MAIN
(UP TO 13V)
V
OUT
=
[1 + (R1 / R2)] x V
REF
V
REF
= 1.25V
I
LIM
C1
C2
C
COMP
R
COMP
D1
INTG
+
+
+
-
+
-
-
MAX1748
Gm
+ -
C
INTG
Figure 1. PWM Boost Converter Block Diagram
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相關代理商/技術參數 |
參數描述 |
|---|---|
| MAX1748EUE+ | 功能描述:直流/直流開關轉換器 Triple-Output TFT LCD DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1748EUE+T | 功能描述:直流/直流開關轉換器 Triple-Output TFT LCD DC/DC Converters RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1748EUE-T | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| MAX1748EUE-TG069 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1748EVKIT | 功能描述:電源管理IC開發(fā)工具 MAX1748 Eval Kit RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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